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手机(iPhone等)拍摄的 mov 视频，旋转信息只保存在 display matrix 元数据中， JavaCV 逐帧转码时帧本身未旋转，而 FFmpegFrameRecorder 未写入该元数据， 导致转码后的 mp4 方向错误。现从 grabber 读取 displayRotation 并设置到 recorder。 Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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问题
手机（如 iPhone）拍摄的竖屏 mov 视频，旋转信息只存在 display matrix 元数据里。
Mediatomp4Service用 JavaCV 逐帧转码，帧本身未旋转，且FFmpegFrameRecorder没有写入该元数据，所以转码出来的 mp4 播放时被旋转了 90°。修改
在
configureRecorder中读取grabber.getDisplayRotation()，非 0 时调用recorder.setDisplayRotation(...)写入输出文件（二者角度约定一致，均为 ffmpegav_display_rotation_*）。仅新增 5 行。验证
已用 JDK 21 编译打包通过。竖屏 iPhone mov 的实际预览效果请合并前由维护者/评审再确认。
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